I'm very interested in OpenWrt for these and other AP's... What's the benefits? Seems like there would be little for an AP, but a strong benefit would be the advanced queuing and airtime fairness stuff of the make-wifi-fast project. See here https://forum.openwrt.org/t/aql-and-the-ath10k-is-lovely/59002 and other places. For a while some of this work has been in OpenWrt for ath9k radios, just now coming out for the ath10k ones, and a few others I think...
I've been running this on my C7 AP, snapshot of a month or so back, and it's nice to see my 5Ghz radio finally equally low in latency as my 2.4Ghz, and the rest of my cake sql managed network...
Also, I believe the EAP225 v3 is very close in hardware to the C7, which should make it easy, havent found yet what the EAP245 is made with.